C++ String::append方法代码示例

    static void OnUserDataApiGet1(const ClientModels::GetUserDataResult& result, void* customData)
    {
        auto it = result.Data.find(TEST_DATA_KEY);
        testMessageInt = (it == result.Data.end()) ? 1 : atoi(it->second.Value.c_str());
        // testMessageTime = it->second.LastUpdated; // Don't need the first time

        testMessageInt = (testMessageInt + 1) % 100;
        ClientModels::UpdateUserDataRequest updateRequest;

        // itoa is not avaialable in android
        char buffer[16];
        Aws::String temp;
        sprintf(buffer, "%d", testMessageInt);
        temp.append(buffer);

        updateRequest.Data[TEST_DATA_KEY] = temp;
        clientApi->UpdateUserData(updateRequest, OnUserDataApiUpdate, OnSharedError, customData);
    }

bool AWSAuthV4Signer::PresignRequest(Aws::Http::HttpRequest& request, const char* region, const char* serviceName, long long expirationTimeInSeconds) const
{
    AWSCredentials credentials = m_credentialsProvider->GetAWSCredentials();

    //don't sign anonymous requests
    if (credentials.GetAWSAccessKeyId().empty() || credentials.GetAWSSecretKey().empty())
    {
        return true;
    }

    Aws::StringStream intConversionStream;
    intConversionStream << expirationTimeInSeconds;
    request.AddQueryStringParameter(Http::X_AMZ_EXPIRES_HEADER, intConversionStream.str());

    if (!credentials.GetSessionToken().empty())
    {
        request.AddQueryStringParameter(Http::AWS_SECURITY_TOKEN, credentials.GetSessionToken());
    }

    //calculate date header to use in internal signature (this also goes into date header).
    DateTime now = GetSigningTimestamp();
    Aws::String dateQueryValue = now.ToGmtString(LONG_DATE_FORMAT_STR);
    request.AddQueryStringParameter(Http::AWS_DATE_HEADER, dateQueryValue);

    Aws::StringStream ss;
    ss << Http::HOST_HEADER << ":" << request.GetHeaderValue(Http::HOST_HEADER) << NEWLINE;
    Aws::String canonicalHeadersString(ss.str());
    ss.str("");

    AWS_LOGSTREAM_DEBUG(v4LogTag, "Canonical Header String: " << canonicalHeadersString);

    //calculate signed headers parameter
    Aws::String signedHeadersValue(Http::HOST_HEADER);
    request.AddQueryStringParameter(X_AMZ_SIGNED_HEADERS, signedHeadersValue);

    AWS_LOGSTREAM_DEBUG(v4LogTag, "Signed Headers value: " << signedHeadersValue);

    Aws::String simpleDate = now.ToGmtString(SIMPLE_DATE_FORMAT_STR);
    ss << credentials.GetAWSAccessKeyId() << "/" << simpleDate
        << "/" << region << "/" << serviceName << "/" << AWS4_REQUEST;

    request.AddQueryStringParameter(X_AMZ_ALGORITHM, AWS_HMAC_SHA256);
    request.AddQueryStringParameter(X_AMZ_CREDENTIAL, ss.str());
    ss.str("");

    //generate generalized canonicalized request string.
    Aws::String canonicalRequestString = CanonicalizeRequestSigningString(request, m_urlEscapePath);

    //append v4 stuff to the canonical request string.
    canonicalRequestString.append(canonicalHeadersString);
    canonicalRequestString.append(NEWLINE);
    canonicalRequestString.append(signedHeadersValue);
    canonicalRequestString.append(NEWLINE);
    canonicalRequestString.append(UNSIGNED_PAYLOAD);
    AWS_LOGSTREAM_DEBUG(v4LogTag, "Canonical Request String: " << canonicalRequestString);

    //now compute sha256 on that request string
    auto hashResult = m_hash->Calculate(canonicalRequestString);
    if (!hashResult.IsSuccess())
    {
        AWS_LOGSTREAM_ERROR(v4LogTag, "Failed to hash (sha256) request string \"" << canonicalRequestString << "\"");
        return false;
    }

    auto sha256Digest = hashResult.GetResult();
    auto cannonicalRequestHash = HashingUtils::HexEncode(sha256Digest);

    auto stringToSign = GenerateStringToSign(dateQueryValue, simpleDate, cannonicalRequestHash);

    auto finalSigningHash = GenerateSignature(credentials, stringToSign, simpleDate);
    if (finalSigningHash.empty())
    {
        return false;
    }

    //add that the signature to the query string    
    request.AddQueryStringParameter(X_AMZ_SIGNATURE, finalSigningHash);

    return true;
}

bool AWSAuthV4Signer::SignRequest(Aws::Http::HttpRequest& request, bool signBody) const
{
    AWSCredentials credentials = m_credentialsProvider->GetAWSCredentials();

    //don't sign anonymous requests
    if (credentials.GetAWSAccessKeyId().empty() || credentials.GetAWSSecretKey().empty())
    {
        return true;
    }

    if (!credentials.GetSessionToken().empty())
    {
        request.SetAwsSessionToken(credentials.GetSessionToken());
    }

    Aws::String payloadHash(UNSIGNED_PAYLOAD);
    if(signBody || request.GetUri().GetScheme() != Http::Scheme::HTTPS)
    {
        payloadHash.assign(ComputePayloadHash(request));
        if (payloadHash.empty())
        {
            return false;
        }
    }
    else
    {
        AWS_LOGSTREAM_DEBUG(v4LogTag, "Note: Http payloads are not being signed. signPayloads=" << m_signPayloads
                << " http scheme=" << Http::SchemeMapper::ToString(request.GetUri().GetScheme()));
    }

    if(m_includeSha256HashHeader)
    {
        request.SetHeaderValue("x-amz-content-sha256", payloadHash);
    }

    //calculate date header to use in internal signature (this also goes into date header).
    DateTime now = GetSigningTimestamp();
    Aws::String dateHeaderValue = now.ToGmtString(LONG_DATE_FORMAT_STR);
    request.SetHeaderValue(AWS_DATE_HEADER, dateHeaderValue);

    Aws::StringStream headersStream;
    Aws::StringStream signedHeadersStream;

    for (const auto& header : CanonicalizeHeaders(request.GetHeaders()))
    {
        if(ShouldSignHeader(header.first))
        {
            headersStream << header.first.c_str() << ":" << header.second.c_str() << NEWLINE;
            signedHeadersStream << header.first.c_str() << ";";
        }
    }

    Aws::String canonicalHeadersString = headersStream.str();
    AWS_LOGSTREAM_DEBUG(v4LogTag, "Canonical Header String: " << canonicalHeadersString);

    //calculate signed headers parameter
    Aws::String signedHeadersValue = signedHeadersStream.str();
    //remove that last semi-colon
    signedHeadersValue.erase(signedHeadersValue.length() - 1);
    AWS_LOGSTREAM_DEBUG(v4LogTag, "Signed Headers value:" << signedHeadersValue);

    //generate generalized canonicalized request string.
    Aws::String canonicalRequestString = CanonicalizeRequestSigningString(request, m_urlEscapePath);

    //append v4 stuff to the canonical request string.
    canonicalRequestString.append(canonicalHeadersString);
    canonicalRequestString.append(NEWLINE);
    canonicalRequestString.append(signedHeadersValue);
    canonicalRequestString.append(NEWLINE);
    canonicalRequestString.append(payloadHash);

    AWS_LOGSTREAM_DEBUG(v4LogTag, "Canonical Request String: " << canonicalRequestString);

    //now compute sha256 on that request string
    auto hashResult = m_hash->Calculate(canonicalRequestString);
    if (!hashResult.IsSuccess())
    {
        AWS_LOGSTREAM_ERROR(v4LogTag, "Failed to hash (sha256) request string \"" << canonicalRequestString << "\"");
        return false;
    }

    auto sha256Digest = hashResult.GetResult();
    Aws::String cannonicalRequestHash = HashingUtils::HexEncode(sha256Digest);
    Aws::String simpleDate = now.ToGmtString(SIMPLE_DATE_FORMAT_STR);

    Aws::String stringToSign = GenerateStringToSign(dateHeaderValue, simpleDate, cannonicalRequestHash);
    auto finalSignature = GenerateSignature(credentials, stringToSign, simpleDate);

    Aws::StringStream ss;
    ss << AWS_HMAC_SHA256 << " " << CREDENTIAL << EQ << credentials.GetAWSAccessKeyId() << "/" << simpleDate
        << "/" << m_region << "/" << m_serviceName << "/" << AWS4_REQUEST << ", " << SIGNED_HEADERS << EQ
        << signedHeadersValue << ", " << SIGNATURE << EQ << finalSignature;

    auto awsAuthString = ss.str();
    AWS_LOGSTREAM_DEBUG(v4LogTag, "Signing request with: " << awsAuthString);
    request.SetAwsAuthorization(awsAuthString);

    return true;
}